Quantum Computing with Silicon Spins

Quantum computing holds the potential to solve key tasks exponentially faster than classical computers, giving birth to a new quantum era. Classical transistor scaling achieved the integration of billions of transistors on-chip reaching sizes so small to hold an individual electron or hole. The magnetic moment of the electron -- the spin – is a prime contender for building scalable quantum bits out of the classical transistors, thus making semiconductor spins one of the leading candidates for full-scale quantum computing. In this presentation, I will cover recent progress from the NCCR SPIN, the Swiss National Program on Quantum Computation with silicon and germanium spin qubits. Some of the highlights include ultrafast and highly tunable qubits and operation at temperatures up to 5 K, where vast cooling power becomes available e.g. for integration of the classical control electronics. We have demonstrated a compromise free sweet spot combining qubit coherence and speed, as well as operation of a 2-qubit gate with highly anisotropic exchange, allowing for high fidelity gate operation while operating at high speeds.